20553966 has 16 divisors (see below), whose sum is σ = 45675600. Its totient is φ = 6851304.

The previous prime is 20553947. The next prime is 20553979. The reversal of 20553966 is 66935502.

20553966 is nontrivially palindromic in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 20553966.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190261 + ... + 190368.

It is an arithmetic number, because the mean of its divisors is an integer number (2854725).

Almost surely, 2^20553966 is an apocalyptic number.

20553966 is an abundant number, since it is smaller than the sum of its proper divisors (25121634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20553966 is a wasteful number, since it uses less digits than its factorization.

20553966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380640 (or 380634 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 20553966 is about 4533.6481998497. The cubic root of 20553966 is about 273.9251309464.

The spelling of 20553966 in words is "twenty million, five hundred fifty-three thousand, nine hundred sixty-six".